Home / 20,690.88-31,028.76-7,539.36

Finding the Fourth Proportional to 20,690.88, 31,028.76 and 7,539.36

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Solution

The fourth proportional to 20,690.88, 31,028.76 and 7,539.36 is: 11,306.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.88 : 31,028.76 = 7,539.36 : x
  2. Step 2: Convert to fraction form
    20,690.88/31,028.76 = 7,539.36/x
  3. Step 3: Cross multiply
    20,690.88x = 31,028.76 × 7,539.36
  4. Step 4: Simplify right side
    20,690.88x = 233,936,991.99
  5. Step 5: Solve for x
    x = 233,936,991.99/20,690.88
  6. Step 6: Final answer
    x = 11,306.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.